(L to R) King Willem-Alexander of the Netherlands, Queen Maxima of the Netherlands, Belgium's King Philippe I and Belgium's Queen Mathilde walk to light candles to pay tribute to the victims after the main ceremony to mark the 70th anniversary of the liberation of the death camp on January 27, 2015 at the former Nazi concentration camp Auschwitz-Birkenau in Oswiecim, Poland. Seventy years after the liberation of Auschwitz, ageing survivors and dignitaries gather at the site synonymous with the Holocaust to honour victims and sound the alarm over a fresh wave of anti-Semitism. AFP PHOTO / JANEK SKARZYNSKI (Photo credit should read JANEK SKARZYNSKI/AFP/Getty Images)